ESTRO 2023 - Abstract Book

S319

Sunday 14 May 2023

ESTRO 2023

Materials and Methods Total five patients of head and neck cancers were treated with HDR -BT between 2020-22. There were two patients treated with brachytherapy alone as a radical setting and as a salvage re-radiation post primary treatment in other three cases. The catheters were placed using the free hand technique. CT based planning was done for all the patients and a customized wax coated lead shield was placed to protect the alveolar structures. Surface mold brachytherapy was employed in isolated small superficial (<5mm deep) palatal recurrence post radiation and not willing for surgery using an acrylic mould along with flexible nylon catheters. The dose fractionation used was 4.0 Gy twice per day (b.i.d) to 44 Gy for definitive treatment and 3Gy b.i.d to 36 Gy in recurrent setting. HDR -BT was started 5 days after catheter insertion to allow adequate healing of the tissue and settling of edema. Patients were followed up as per the institute protocol. Results The median follow-up of the patients was 10 months. The mean dose in radical and reirradiation settings was 44Gy in 11 fractions and 36 Gy in 12 fractions respectively.The acute toxicity outcome was measured by RTOG toxicity grading and majority of the acute toxicities were Grade II . Barring one patient, rest of the patients had complete response at local site on last follow-up. The procedures were uneventful and no significant post-operative complications were noted.